Improvement in attaching knobs to spindles



UNITED STATES PATENT OFFICE.

IMPROVEMENT IN ATTACHING KNOBS TO SPINDLES.

Specification forming part of Letters Patent No. 101,808-, dated April12, 1870.

To all lwhom it may concern:

Be it known that I, MATHEW ANDREW, of Melbourne, Victoria, have inventeda new and useful Improvement in Door-Knobs; and I do hereby declare thefollowing to be a full, clear, and exact description thereof, which willenable those skilled in the art to make and use the same, referencebeing had to the'accoinpanying drawings, forming part ot thisspecitication, in whichv Figure l represents a sectional side elevationot' this invention. Fig. 2 is a transverse section thereof.

Similar letters indicate corresponding parte.

This invention relates toan improvementin that class of door-knobs whichare fastened on their spindles by a spring-catch and ratchetteeth, sothat the distance between the two knobs can be readily adjusted tocorrespond to the thickness ofthe door to which they are to be attached.

My invention consists in the arrangement of a spring-catch extendingbeyond the side of the spindle, in combination with a hole extendingthrough the slIa/nk of the knob and situated at the side of the spindle,in such a manner that by inserting a brad-awl or other like instrumentinto the hole in the knob the spring can be forced back and the knobreleased, while the spindle retains its full strength.

In the drawings. the letter A designates a door-knob, made of any'suitable material, and provided with a socket to receive the spindleB. One side of this spindle is provided with a series of ratchet-teeth,a, and in the socket ofthe knob is formed a chamber, b, to receive thespring-catch c. It' the spindle is pushed into its socket, thisspring-catch engages with the ratchet-teeth and retains said spindle,the ratchet-teeth being so formed that they slide over the catch whenthe spindle is pushed in; but they do not allow of the spindle' beingwithdrawn. In order to release the spindle the spring-catch has to bepressed back, and to effeet this purpose-I make `the spring-catch so`that it projects over one side of the spindle,

and in the shank of the knob I produce a hole, d, which passes down atthe side of the spindle opposite the projecting portion ot' thespringcatch. (Best seen in Fig. 2 oi' the drawings.) By inserting abrad-awl or other similar instrument into this hole the spring-catch canbe readily pressed back and the spindle released.

I am aware that a spindle provided withl ratchet-teeth as a means forsecuring the same in the knob has already been used; but in all cases ofthis kind known to lne the spindle is provided with a slot, thongh whichthe instrunient for disengaging passes, and 'by such slot theconstruction ot' the spindle is rendered extremely difficult, and,furthermore, the spindle is weakened, so that it is liable to bewrenched of'in a short time.

By my invention I am enabled to dispense with the slotin the spindle, sothat said spindle can be easily made, and that it retains its fullstrength.

I do not claim, broadly, as myinvention the arrangement of ratchet-teethand a catch for the purpose of fastenipg door-knobs on their spindles;but,

Having thus, fully described my invention, what I claiin as new, anddesire to secure by Letters Patent, is-

The at spring G, attached to the knob-spindle and adapted to engage withthe ratchetteeth a a, and extended beyond the side ofthe spindle B, incombination with the extended chamber b and the opening d in the shankof the knob A, substantially as and for the purpose set l'orth.

MAT W. ANDREW.

Witnesses W. HAUFF, E. F. KASTENHUBER.

